자원환경지질 (Economic and Environmental Geology)

  • 제53권6호
  • /
  • Pages.743-753
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  • 2020
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  • 1225-7281(pISSN)
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  • 2288-7962(eISSN)
대한자원환경지질학회 (The Korean Society of Economic and Environmental Geology)
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폐석탄광 하류 밭토양 및 논토양의 중금속 함량과 광물조성에 따른 분광학적 특성

Spectral Characteristics associated with Heavy Metal Concentration and Mineral Composition in Cropland and Rice Field Soils from Downstream of an Abandoned Coal Mine

  • 서지희 (충남대학교 우주.지질학과) ;
  • 유재형 (충남대학교 지질환경과학과) ;
  • 고상모 (한국지질자원연구원 DMR융합연구단) ;
  • 이범한 (한국지질자원연구원 DMR융합연구단)
  • Seo, Jihee (Department of Astronomy, Space Science, & Geology, Chungnam National University) ;
  • Yu, Jaehyung (Department of Geological Sciences, Chungnam National University) ;
  • Koh, Sang-Mo (Convergence research center for development of mineral resources (DMR), Korea Institute of Geoscience and Mineral Resources) ;
  • Lee, Bum Han (Convergence research center for development of mineral resources (DMR), Korea Institute of Geoscience and Mineral Resources)
  • 투고 : 2020.10.12
  • 심사 : 2020.12.02
  • 발행 : 2020.12.28
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초록

본 연구는 폐석탄광산인 옥동탄광 하류에 위치한 밭토양과 논토양을 대상으로 중금속함량, 광물조성, 분광특성을 고찰하였다. X선 형광분석 결과 밭토양과 논토양 모두 비소가 토양환경오염 우려기준을 초과하여 검출되었으며 밭토양이 논토양보다 중금속오염지수가 상대적으로 높은 것을 확인하였다. X선 회절분석 결과 밭토양과 논토양 모두에서 석영, 방해석, 고령토, 일라이트, 스멕타이트, 자철석 그리고 적철석 광물이 검출되었다. 또한 유기물 분석을 실시한 결과 밭토양의 유기물 함량 변이가 더 큰 것으로 나타났다. 분광분석 결과 밭토양과 논토양의 전체적인 반사도 곡선의 양상과 흡광특성은 유사하게 발현됨을 확인하였다. 490nm 부근과 900nm 부근에서 토양 내 산화철에 의해, 1410nm, 1910nm 부근과 2200nm 부근에서 점토광물인 고령토와 스멕타이트군에 의한 흡광특성이 두드러지게 나타났으며 유기물의 함량이 많을수록 반사도가 감소하였다. 흡광 깊이는 밭토양과 논토양 모두 흡광특성이 발현되는 곳에서 오염 지수가 높아짐에 따라 흡광깊이는 얕아졌으며, 유기물 함량이 증가함에 따라 490nm 부근과 1916nm 부근의 흡광깊이가 얕아지는 경향을 보였다.

This study analyzed heavy metal concentration, mineral composition, and spectral characteristics of heavy metal contaminated soil samples of cropland and rice field located in downstream of abandoned Okdong coal mine. X-ray fluorescence analysis detected heavy metal elements including cadmium, copper, arsenic, lead, zinc and nickel in the soils. Both cropland and rice field samples were severely contaminated with arsenic showing higher concentration over the concerned standard. The pollution index of cropland samples was higher than that of rice field samples. X-ray powder diffraction analysis identified that the mineral composition of cropland and rice field samples is similar with quartz, calcite, kaolinite, illite, smectite, magnetite and hematite. The range of organic matter content were more widely distributed in cropland samples. The spectral analysis showed that the reflectance spectra and the absorption features of cropland and rice field samples were alike. The absorption features that appeared near 490nm and 900nm were attributed to the ferric iron, and clay minerals such as kaolinite and smectite caused the absorption features at 1410nm, 1910nm and 2200nm. The reflectance of the soil spectral decreased with an increase in organic content. The absorption depths of both types of soil samples decreased with higher organic matter content at 490nm and 1916nm as well as higher heavy metal concentration.

키워드

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